Micrometer-caliper



I F. 0. JAQUES, Sn.

MICROMETEH CALIPER.

Patented Aug. 17, 1920.

APPLICATION FILED JAN. 20, I920.

fig. 1

I aima4am f mgi,

I merals which by dividingone-thousandths UNITED" STATE ATENT OFFICE.

OSCAR JAQUES SE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR T0 FERNANDO OSCAR J'A QUES, JR., 0F PROVIDENCE, RHODE ISLAND.

MICBQMETEB-UALIPEB.

To all whom it may concern:

Be it known that I, FERNANDO OSCAR Jaouns, Sn, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful lmprovement in Microrneter-(lalipers, of which the following is a specification.

The so called standard form of a micrometer caliper has a scale reading by one thousandths of an inch up to a predetermined limit,'usually one inch. Therefore the standard form of micrometer calipers in general use, do not easily give a finer accurate reading of lessthan one-thousandths of aninch. On extremely fine work it is necessary to caliper or gage the work by the use of a micrometer reading to much less than one thousan-dths of an inch.

The object of my invention is to improve the construction of a micrometer caliper whereby the same is provided'with two sets of scales each consisting of lines and numerals for indicating units oft measurement, one set indicating units ofmeasurement by one-thousandth of an inch and the other set indicating units of measurement by inch h or preferably one ten-thousandths of an,

or one twenty-thousandths of an in less according to the number of lines that can be easily and accurately seen on" the scale.

My invention consistsin the peculiar and novel construction of a micrometer caliper, constructed to read by lines and numerals to materially less than one-thousandths of an inch, said micrometer caliper having a thimble on which (are lines and numerals reading by onethous andths of an inch, a "second thimblepn .whichaare linesand nuof an inch 'intouas many parts as desired, preierably into rten orrtwenty parts, will gives. reading byene tenor one twentythousandths of an inch or less, means for synchronously operating the thimblesat the ratio desired, and details oi construction, as will be more fully set torth hereinafter and Specification of Letters Patent.

Application {flied January 20,

View through the caliper,

. beveled end Patented Aug. 17, 1920.

1920. seriai No. 852,718.

7 Figure 1 is a side View of a micrometer caliper provided with my invention.

Fig. 2 is an enlarged. sectional view taken longitudinally through the o tierating mechanism of the caliper and showing the caliper handle broken away.

Fi g. 3 is an enlarged transverse sectional view through the caliper, taken on line 3, 3% of Fig. 1, looking in the direction oi the arrows a, a, and

Fig. 4 is an enlarged transverse sectional taken on line 4, l of Fig. 1, looking in the direction of the arrows b, b.

In the drawing, 5 indicates a U shaped handle, 6 an anvil, 7 a barrel on which are the lines and numerals 8. The handle 5 has an extension 9 constructed to have a fingerhold 10 and an end 11.. The inner edge of the extension 9 is parallel with the barrel 7 and the end 11 is at right angles to the barrel, as shown in Fig. 1. An adjusting member 12 having a screw-head slot 13 is adjustably secured to the end 11 of the extension 9 by a screw 14 through the slot 13. The adjusting member 12 has an arm 15 to which a round rod 16 is pivotally secured by a screw 17 through the inner end of the rod into the arm 15, as shown in Fig. 2. A spindle 18 extends through the handle 5 and barrel 7 in alinement with the anvil 6, and 0 is in screw-threaded engagement with the barrel 7, the outer end portion 19 of the spindle being slightly reduced in size. A thimble 20 is fixed at its outer end to the spindle 18 with which it turns. The thimble 20 has longitudinal indicating lines 21, 21 and a beveled inner end 22 on which are the lines and numerals 23, which in connection with the lines and numerals 8 on the barrel 7' indicates measurements one-thousandths of an inch. A second thimble 24 over the thimble 20 is rotatably supported on the spindle 18 at the outer end of the thimble 20 and has a pinion 25 and an inner 26' on which are the lines and numerals 27 which in connection with the indicating lines 21, 21 on the thianble 20 4 divide one-thousnndths of an inch into a predetermined number of parts. An integrul gear 28 and pinion 2) has a rotating and reciprocal support on the rod it; with the gear 28 meshing with the iinion 25 on the second Thimble 53 1. The pinion 29 meshes with a ,s enr 1W lire-d to a knurled operating member 25] \Vllltll in turn is lined to the reduced outer end portion 19 of the spindle 18, as shown in l' igs. l and :1.

The gearing is adjusted to eliminate play by adjusting the adjusting member 12 on the end 1] of the, extension 9 and the indicating lines 27 on the second thimblc 24 may be alined with the indicating lines 21, 21 on the thiniblc 20 by adjusting the rod l6 sidewise on the arm 15 of the adjusting member l2, both of which requires only very slight adjustments.

As shown in Fig. 3 the thirnble has the usual 25 lines on its beveled end each of which indicates a thousandths part of an inch and the longitudinal indicating lines 21, 21. as shown in Fig. l, and the second thimble 24 is shown to have on its beveled and 20 lines each of which indicates a twenty-thousandths part of an inch, if the ratio of the gearing is such as to revolve the second thimble 24 one revolution for one-twentv fifth of a revolution of the thimble 20. Vl ith this ratio of the gearing the reading of the caliper as shown in Fig. 1, would be two-hundred and fifty thousandths and one twenty thousandths part of an inch, or one quarter and one twenty thousandths part of an inch. The caliper is operated by turning the operating member 31, in either direction and the ratio of the gearing may be such as to give as fine a reading as may be desired.

aving thus described my invention I claim as new:

1. A micrometer caliper having a handle, a barrel on the handle, provided with graduations for indicating units of measurement, a spindle screw-threaded through the barrel, :1 thimble fixed to the spindle, and means on the thimble for indicating division of units of measurement, a second thimble sleeved on to the first thimble, and means on the second thimble for indicating sub-divisions of units of measurement, means for rotatably supporting the second thimble and means for rotating the secondthimble coincidently with and at a greater speed than the first thimble.

2. A micrometer caliper having a handle, a barrel on the handle, provided with graduations for indicating unitsof measurement, a spindle screw-threaded throu h the; barrel, atliimble fixed to the spin e and having means for indicating divisions of units of measurement, a second thimble rotatably supported on the spindleand having means for lndicating subdivisions-of units of measurement, and means for rotating the second thimlile eoincidently with and at a greater speed than the first thimble.

3. A micrometer caliper having a handle, a barrcl n tlr handle,.pr0vi(lcd with graduations for indicating units of measurement, :1 spindle screw-threaded through the barrel, a thimble fixed to the s indle and inning means for indicating ivisions of units of measurement, a second thimble rotatably supported over the first thimble and having means for indicating sub-divisions of units of measurement, means for rotatably supporting the second thimble, andmeans for rotating the second thimble coincidently with and at a greater speed than the first thimble.

4. A micrometer caliper having a handle, a barrel on the handle and provided with graduations for indicating units of measurement, a spindle screw-threaded through the barrel, a thimble fixed to the spindle and having means for indicating divisions of units of measurements, a second thimble rotatably supported on the spindle and having means for indicating sub-divisions of units of measurements, an operating member fixed to the spindle, and means for operatively connecting the operating member with the second thimble whereby the second thimble is operated coincidently with and at a greater speed than the first thimble.

5. A micrometer caliper having a handle, a barrel on the handle and provided with graduations for indicating units of measurement, a spindle screw-threaded through the barrel, a thimble fixed to the spindle and having means for indicating divisions of units of measurements, a second thim'ble rotatably supported on the spindle and having a pinion and means for indicating subdivisions of units of measurements, an operating member fixed to the spindle and having a gear, a rod adjustably secured to the handle, an integral gear and pinion ro- 110 tatablv and reciprocally supported on the rod, the gear meshing with the pinion on the second thimble and the pinion meshing with the gear on the operating member, whereby the second thim'ble is operated (30- 115 incidently with and at a greater speed than the first thimble.

6. A micrometer caliper having a handle, a barrel on the handle and provided with graduations for indicating units or measureme'nt, a spindle screw-threaded three h the barrel, a thim ble fixed to the spin is and having lines and numerals on its end and longitudinal lines indicating divisions of units of measurement, a second thimble rotatably supported on the spindle and'hsiV- in'ga pmion and lines and numerals indicating sub-divisions of units of measurement, an operating member fixed to the spindle, and having a gear, an adjusting member adjustably secured to the handle, a rod pivotally secured to the adjusting member, an integral gear and pinion rotatably and reciprocally supported on the rod, the gear meshing with the pinion on the second thimble and the pinion meshing with the gear on the operating member, and means for holding the gears and pinions in mesh, whereby the second thimble is operated coincidently with and at a greater 10 speed than the first thimble and the operating parts may be adjusted for accuracy.

In testimony whereof, I have signed my name to this specification.

FERNANDO OSCAR JAQUES, SR. 

